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Net Earnings (Loss) Per Common Share - Calculation of Basic and Diluted Net Earnings (Loss) Per Common Share (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Numerator    
Net earnings (loss) available to common stockholders $ 2.7 $ (6.0)
Distributed and allocated undistributed net earnings (loss) to non-vested restricted stockholders (0.1) (0.1)
Distributed and allocated undistributed net earnings (loss) to common stockholders 2.6 (6.1)
Distributed net earnings (loss) - dividends paid to common stockholders (25.3) (25.1)
Allocation of undistributed net earnings (loss) to common stockholders (22.7) (31.2)
Denominator    
Weighted average number of common shares outstanding - basic 193.8 191.9
Basic net earnings (loss) per common share:    
Distributed net earnings (loss) to common stockholders $ 0.13 $ 0.13
Allocated undistributed net earnings (loss) to common stockholders $ (0.12) $ (0.16)
Net earnings (loss) per common share-basic $ 0.01 $ (0.03)
Numerator    
Distributed and allocated undistributed net earnings (loss) to common stockholders 2.6 (6.1)
Add: Allocated undistributed net earnings (loss) to non-vested restricted stockholders      
Less: Undistributed net earnings (loss) reallocated to non-vested restricted stockholders      
Net earnings (loss) available to common stockholders - diluted $ 2.6 $ (6.1)
Denominator    
Weighted average number of common shares outstanding - basic 193.8 191.9
Effect of assumed issuance of Settlement agreement shares 18.0  
Effect of non-vested restricted stock units 0.9  
Weighted average number of common shares outstanding - diluted 212.7 191.9
Diluted net earnings (loss) per common share $ 0.01 $ (0.03)